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-rw-r--r--Documentation/ABI/testing/sysfs-devices-platform-_UDC_-gadget12
-rw-r--r--drivers/usb/gadget/file_storage.c31
-rw-r--r--drivers/usb/gadget/storage_common.c28
3 files changed, 64 insertions, 7 deletions
diff --git a/Documentation/ABI/testing/sysfs-devices-platform-_UDC_-gadget b/Documentation/ABI/testing/sysfs-devices-platform-_UDC_-gadget
index 34034027b13..d548eaac230 100644
--- a/Documentation/ABI/testing/sysfs-devices-platform-_UDC_-gadget
+++ b/Documentation/ABI/testing/sysfs-devices-platform-_UDC_-gadget
@@ -7,3 +7,15 @@ Description:
0 -> resumed
(_UDC_ is the name of the USB Device Controller driver)
+
+What: /sys/devices/platform/_UDC_/gadget/gadget-lunX/nofua
+Date: July 2010
+Contact: Andy Shevchenko <andy.shevchenko@gmail.com>
+Description:
+ Show or set the reaction on the FUA (Force Unit Access) bit in
+ the SCSI WRITE(10,12) commands when a gadget in USB Mass
+ Storage mode.
+
+ Possible values are:
+ 1 -> ignore the FUA flag
+ 0 -> obey the FUA flag
diff --git a/drivers/usb/gadget/file_storage.c b/drivers/usb/gadget/file_storage.c
index d57c09f764d..88e5ad2bc71 100644
--- a/drivers/usb/gadget/file_storage.c
+++ b/drivers/usb/gadget/file_storage.c
@@ -93,6 +93,8 @@
* removable Default false, boolean for removable media
* luns=N Default N = number of filenames, number of
* LUNs to support
+ * nofua=b[,b...] Default false, booleans for ignore FUA flag
+ * in SCSI WRITE(10,12) commands
* stall Default determined according to the type of
* USB device controller (usually true),
* boolean to permit the driver to halt
@@ -112,12 +114,12 @@
* PAGE_CACHE_SIZE)
*
* If CONFIG_USB_FILE_STORAGE_TEST is not set, only the "file", "ro",
- * "removable", "luns", "stall", and "cdrom" options are available; default
- * values are used for everything else.
+ * "removable", "luns", "nofua", "stall", and "cdrom" options are available;
+ * default values are used for everything else.
*
* The pathnames of the backing files and the ro settings are available in
- * the attribute files "file" and "ro" in the lun<n> subdirectory of the
- * gadget's sysfs directory. If the "removable" option is set, writing to
+ * the attribute files "file", "nofua", and "ro" in the lun<n> subdirectory of
+ * the gadget's sysfs directory. If the "removable" option is set, writing to
* these files will simulate ejecting/loading the medium (writing an empty
* line means eject) and adjusting a write-enable tab. Changes to the ro
* setting are not allowed when the medium is loaded or if CD-ROM emulation
@@ -304,8 +306,10 @@ MODULE_LICENSE("Dual BSD/GPL");
static struct {
char *file[FSG_MAX_LUNS];
int ro[FSG_MAX_LUNS];
+ int nofua[FSG_MAX_LUNS];
unsigned int num_filenames;
unsigned int num_ros;
+ unsigned int num_nofuas;
unsigned int nluns;
int removable;
@@ -345,6 +349,10 @@ MODULE_PARM_DESC(file, "names of backing files or devices");
module_param_array_named(ro, mod_data.ro, bool, &mod_data.num_ros, S_IRUGO);
MODULE_PARM_DESC(ro, "true to force read-only");
+module_param_array_named(nofua, mod_data.nofua, bool, &mod_data.num_nofuas,
+ S_IRUGO);
+MODULE_PARM_DESC(nofua, "true to ignore SCSI WRITE(10,12) FUA bit");
+
module_param_named(luns, mod_data.nluns, uint, S_IRUGO);
MODULE_PARM_DESC(luns, "number of LUNs");
@@ -1279,7 +1287,8 @@ static int do_write(struct fsg_dev *fsg)
curlun->sense_data = SS_INVALID_FIELD_IN_CDB;
return -EINVAL;
}
- if (fsg->cmnd[1] & 0x08) { // FUA
+ /* FUA */
+ if (!curlun->nofua && (fsg->cmnd[1] & 0x08)) {
spin_lock(&curlun->filp->f_lock);
curlun->filp->f_flags |= O_DSYNC;
spin_unlock(&curlun->filp->f_lock);
@@ -3133,6 +3142,7 @@ static int fsg_main_thread(void *fsg_)
/* The write permissions and store_xxx pointers are set in fsg_bind() */
static DEVICE_ATTR(ro, 0444, fsg_show_ro, NULL);
+static DEVICE_ATTR(nofua, 0644, fsg_show_nofua, NULL);
static DEVICE_ATTR(file, 0444, fsg_show_file, NULL);
@@ -3362,6 +3372,10 @@ static int __ref fsg_bind(struct usb_gadget *gadget)
}
}
+ /* Only for removable media? */
+ dev_attr_nofua.attr.mode = 0644;
+ dev_attr_nofua.store = fsg_store_nofua;
+
/* Find out how many LUNs there should be */
i = mod_data.nluns;
if (i == 0)
@@ -3387,6 +3401,7 @@ static int __ref fsg_bind(struct usb_gadget *gadget)
curlun->ro = mod_data.cdrom || mod_data.ro[i];
curlun->initially_ro = curlun->ro;
curlun->removable = mod_data.removable;
+ curlun->nofua = mod_data.nofua[i];
curlun->dev.release = lun_release;
curlun->dev.parent = &gadget->dev;
curlun->dev.driver = &fsg_driver.driver;
@@ -3401,6 +3416,8 @@ static int __ref fsg_bind(struct usb_gadget *gadget)
if ((rc = device_create_file(&curlun->dev,
&dev_attr_ro)) != 0 ||
(rc = device_create_file(&curlun->dev,
+ &dev_attr_nofua)) != 0 ||
+ (rc = device_create_file(&curlun->dev,
&dev_attr_file)) != 0) {
device_unregister(&curlun->dev);
goto out;
@@ -3525,8 +3542,8 @@ static int __ref fsg_bind(struct usb_gadget *gadget)
if (IS_ERR(p))
p = NULL;
}
- LINFO(curlun, "ro=%d, file: %s\n",
- curlun->ro, (p ? p : "(error)"));
+ LINFO(curlun, "ro=%d, nofua=%d, file: %s\n",
+ curlun->ro, curlun->nofua, (p ? p : "(error)"));
}
}
kfree(pathbuf);
diff --git a/drivers/usb/gadget/storage_common.c b/drivers/usb/gadget/storage_common.c
index 3bbddab72e5..484acfb1a7c 100644
--- a/drivers/usb/gadget/storage_common.c
+++ b/drivers/usb/gadget/storage_common.c
@@ -284,6 +284,7 @@ struct fsg_lun {
unsigned int prevent_medium_removal:1;
unsigned int registered:1;
unsigned int info_valid:1;
+ unsigned int nofua:1;
u32 sense_data;
u32 sense_data_info;
@@ -714,6 +715,14 @@ static ssize_t fsg_show_ro(struct device *dev, struct device_attribute *attr,
: curlun->initially_ro);
}
+static ssize_t fsg_show_nofua(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct fsg_lun *curlun = fsg_lun_from_dev(dev);
+
+ return sprintf(buf, "%u\n", curlun->nofua);
+}
+
static ssize_t fsg_show_file(struct device *dev, struct device_attribute *attr,
char *buf)
{
@@ -770,6 +779,25 @@ static ssize_t fsg_store_ro(struct device *dev, struct device_attribute *attr,
return rc;
}
+static ssize_t fsg_store_nofua(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct fsg_lun *curlun = fsg_lun_from_dev(dev);
+ unsigned long nofua;
+
+ if (strict_strtoul(buf, 2, &nofua))
+ return -EINVAL;
+
+ /* Sync data when switching from async mode to sync */
+ if (!nofua && curlun->nofua)
+ fsg_lun_fsync_sub(curlun);
+
+ curlun->nofua = nofua;
+
+ return count;
+}
+
static ssize_t fsg_store_file(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{